Plowed yesterday with no problems. Left the house at 6 this morning roads are still ice/snow, truck is running normal, and half way to the shop the truck starts shifting and holding gears like it's in tow/haul. I push the T/H button on and off, no difference, and I've got no CEL yet. I pull into a parking lot and shut it off, restart it, and get a CEL for P0700. I guess this is how my 3500 thanks me for putting a plow on her. It's under warranty so I guess I should just take it in.

you need to look in the tcm for the trans code.a p0700 is a pcm code from the tcm saying its got a code